We didn't get off the car to walk on the dam, because it started raining pretty hard, and we didn't have waterproof gear with us. We only drove over the dam, all the way to the vantage point at the end of the road, and back. Love that shot of the dam up close from the pedestrian walk; I never saw it from that perspective even though I've been there twice, shame.

Springdale is a great choice for place to stay when visiting Zion, as it is right next to the park and takes close to no time to get to the park. Looks like amazing weather at Zion. I envy you having such good weather during your visit. It was pouring rain during our Zion visit, but the gloom and rain could not hide the beauty of Zion. Enjoy your stay and enjoy the breathtaking views.